Q: Power adapters

Welcome to Apple Support Communities

The MacBook Air uses a 45W power adapter and the MacBook Pro uses a 60W (13-inch) or 85W (15-inch and 17-inch) power adapter, so you can check this. If your friend only took the MagSafe cable (and not the power plug), it is the same one.

Absolutely not. The only thing your friend may have seen is that his/her MacBook Pro took more time than usual to get the battery charged.

You are welcome

•Find the right power adapter and cord for your Mac notebook - Apple Support

•Apple Portables: Troubleshooting MagSafe adapters - Apple Support

•45w MagSafe Power Adapter for MacBook Air (note type 2 vs original, for older model)

http://store.apple.com/us/product/MC747LL/A/apple-45w-magsafe-power-adapter-for- macbook-air

{You can see examples of all versions of official magsafe adapters at OWC macsales online}

There were some cautionary notes among the Support articles about using

incorrect adapter with versions of the MacBook builds, where not intended.

Just yesterday someone from Australia had query of MagSafe adapters and

my replies covered more thoroughly than question had asked.

In any event...

Good luck & happy computing!